How Often Do Breast Tissue Expanders Fail Due to Manufacturer's Error?

The expanders perform well.Sometimes the expander can shift in the pocket and it is difficult to locate the expansion port even with the magnet.I recently had to replace one that I had punctured because the expander flipped over on itself and once there are holes you have to replace it so it  is not a manufacturing defect. 

From your posted explanation I suspect it is the IN-experience of the doctor injector! This is why if you do not have an injector take their time injecting you have deflations. Discuss with your surgeon. From MIAMI Dr. darryl J. Blinski, 305 598 0091

This sounds hihgly atypical. I have placed many tissue expanders and although mechanical failures do occur, they are relatively rare.